ARM: lpc32xx: remove legacy irq controller driver

New NXP LPC32xx irq chip driver is used instead of a legacy one.

[this also fixes a harmless build warning about the NR_IRQS redefinition]
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-lpc32xx/Makefile

@@ -2,6 +2,6 @@
 # Makefile for the linux kernel.
 #
 
-obj-y	:= irq.o common.o serial.o
+obj-y	:= common.o serial.o
 obj-y	+= pm.o suspend.o
 obj-y	+= phy3250.o